4.9. Static memory interface

The AMBA Static Memory Interface (SMI)
is an example design which shows the basic requirements of an External
Bus Interface (EBI) in an AMBA system. It is not intended to
be a ready-made EBI for a real system. Such an EBI design would
have to take process, package, and varying external delays into
account.

The SMI connects the AMBA AHB to the external memory bus of
an AMBA microcontroller. This allows the connection of up to three
256MB banks of 32-bit wide static memory (for example, SRAM and
ROM) and also provides 32-bit test access to the AMBA system in
conjunction with the TIC. Figure 4.33 shows the block diagram of the SMI.